#include <iostream>
#include <fstream>
#include <cstdlib>

const int SIZE = 60;

int main(void){
	using namespace std;

	char filename[SIZE];
	ifstream inFile;

	cout << "Enter name of data file: ";
	cin.getline(filename, SIZE);
	inFile.open(filename);
	if (!inFile.is_open()){
		cout << "Could not open the file " << filename << endl;
		cout << "Program terminating.\n" << endl;
		exit(EXIT_FAILURE);
	}

	double value;
	double sum;
	int count = 0;

	inFile >> value;
	while (inFile.good()){
		++count;
		sum += value;
		inFile >> value;
	}
	
	if (inFile.eof())
		cout << "End of file reached.\n";
	else if (inFile.fail())
		cout << "Input terminated by data mismatch.\n";
	else
		cout << "Input terminated by unkown reason.\n";
	
	if (count == 0)
		cout << "No data processed.\n";
	else{
		cout << "Items read: " << count << endl;
		cout << "Sum: " << sum << endl;
		cout << "Average: " << sum / count << endl;
	}

	inFile.close();
	return 0;
}